/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.nutch.indexer.html;

import java.io.ByteArrayInputStream;
import java.nio.ByteBuffer;
import java.util.Collection;
import java.util.HashSet;
import java.util.Scanner;

import org.apache.hadoop.conf.Configuration;
import org.apache.nutch.indexer.IndexingException;
import org.apache.nutch.indexer.IndexingFilter;
import org.apache.nutch.indexer.NutchDocument;
import org.apache.nutch.storage.WebPage;
import org.apache.nutch.storage.WebPage.Field;
import org.apache.nutch.util.MimeUtil;
import org.apache.nutch.util.StringUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Add raw HTML content of a document to the index.
 */

public class HtmlIndexingFilter implements IndexingFilter {
	public static final Logger LOG = LoggerFactory
			.getLogger(HtmlIndexingFilter.class);
	private Configuration conf;

	/**
	 * Get the MimeTypes resolver instance.
	 */
	private MimeUtil MIME;

	private static Collection<WebPage.Field> FIELDS = new HashSet<WebPage.Field>();

	static {
		FIELDS.add(WebPage.Field.CONTENT);
	}

	@Override
	public NutchDocument filter(NutchDocument doc, String url, WebPage page)
			throws IndexingException {
		addRawContent(doc, page, url);
		return doc;
	}

	private NutchDocument addRawContent(NutchDocument doc, WebPage page,
			String url) {
		ByteBuffer raw = page.getContent();
		if (raw != null) {
			if (LOG.isInfoEnabled()) {
				LOG.info("Html indexing for: " + url.toString());
			}
			ByteArrayInputStream arrayInputStream = new ByteArrayInputStream(
					raw.array(), raw.arrayOffset() + raw.position(),
					raw.remaining());
			Scanner scanner = new Scanner(arrayInputStream);
			scanner.useDelimiter("\\Z");// To read all scanner content in one
										// String
			String data = "";
			if (scanner.hasNext()) {
				data = scanner.next();
			}
			doc.add("rawcontent", StringUtil.cleanField(data));
			scanner.close();
		}
		return doc;
	}

	public void addIndexBackendOptions(Configuration conf) {
	}

	public void setConf(Configuration conf) {
		this.conf = conf;
		MIME = new MimeUtil(conf);
	}

	public Configuration getConf() {
		return this.conf;
	}

	@Override
	public Collection<Field> getFields() {
		return FIELDS;
	}

}
